End of Term 1 and Maternity Leave

by Tracie Scavongelli

Term 1 has officially wrapped up! The students spent time using microscopes, triple beam balances, and other science equipment studying cells. They prepared slides with cork slices, pond water, onion plant cells, and even their own cheek cells! Everyone was able to identify the cells’ nuclei and cell membranes. To understand the movement of molecules across the cell membrane, the students engaged in a multi-day lab. Each group placed an egg in vinegar and observed it for three days. By day three, the acid from the vinegar had dissolved the shell, leaving behind a “naked” egg! The students found the mass of the eggs on day 1 and on day 3. The eggs had gained a significant amount of mass by day 3! This showed that osmosis occurred. Molecules of water moved across the egg’s membrane from an area of high concentration outside the egg to low concentration inside the egg. The membranes of our cells act similarly to the egg’s membrane, selectively allowing molecules to move in and out as needed.

Bacteria, viruses, and fungi were next on our agenda. Students learned the difference in structure between bacterial cells, plant and animal cells, and viruses. Seeing things on the microscopic level helped them to understand why viruses are not considered living organisms.

They also learned that not all bacteria, viruses, and fungi are bad for you. To demonstrate the diversity (and deliciousness!) of fungi, the students used yeast to make their own freshly baked pretzels. They were also able to see how the dough rose from the release of carbon dioxide during the fermentation process.

Term 2 will be spent discovering the animal kingdom, ecosystems, and biomes. During this time (beginning December 15th), I will be on maternity leave. Laurene Waltman, the Math Co-teacher, will be covering these units with the students. We have prepared lots of fun projects and activities! I will be checking in often, but also taking time to adjust to my new family routine with our baby boy. I hope you all have a wonderful holiday season and see you in the spring!